CONTAMINANT DETERMINATION IN COLD-ROLLING OIL USING HPSEC WITH RI ANDPDA DETECTION

A size exclusion liquid chromography (HPSEC) method using refractive i ndex (RT) and photodiode array (PDA) detectors and a BASIC calculation program was developed for high molecular weight contaminant determina tion in the C-15 linear paraffin-based cold rolling oil. Eight laborat ory standards were analyzed to determine the new HPSEC/RI calibration factor for the C-15 linear paraffin rolling oil. Three contaminants an d thirteen standard solutions were evaluated to establish calibration curves. The HPSEC/RI/PDA method will quantitatively determine the conc entrations of polyisobutylene-based hydrodynamic backup bearing lubric ant, mist-applied extreme pressure gear oil for the workroll bearing a nd antiwear hydraulic oil in the cold rolling oil. Deviations for back up bearing lubricant, workroll bearing lubricant and hydraulic oil are approximately 3%, 4% and 7% of the contaminant concentration, respect ively. The BASIC calculation program can assist operators in reducing calculation error and improving speed and accuracy for the HPSEC metho d.